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Structure of different Sinorhizobium fredii HH103 surface polysaccharides whose symbiotic relevance has been studied: (A) exopolysaccharide (EPS); (B) cyclic glucans (CG); (C) K-antigen capsular polysaccharide (KPS); and (D) lipopolysaccharide (LPS). ¿OAc?: O-acetyl group of unknown location. Lipid A: LPS moiety anchored to the bacterial external membrane.
